Jacob kinzer



(No Model.)

J. KINZER. MOLD FOR TUBULAR ART'IGLES.

Patented Sept. 3; 1889.

INV nrron,

WITNESSES:

N. PETERS. phowum n'mr. Wnhiugkm m a UNITED STATES PATENT OFFICE.

JACOB KINZER, OF PITTSBURG, PENNSYLVANIA, ASSIGNOR, BY MESNE ASSIGNMENTS, To THE KINZER MANUFACTURING COMPANY, OF

SAME PLACE.

MOLDFOR TUBULAR ARTICLES.

SPECIFICATION forming part of Letters Patent No; 410,285, dated September 3, 1889.

Application filed March 5, 1889. Serial No. 301,970. (No model.) i

To all whom it may concern.-

Be it known that I, JACOB KINZER, a citizen of the United States, residing at Pittsburg,

in the county of Allegheny and State of Pennsylvania, have invented or discovered a certain new and useful Improvement in Molds for Tubular Articles, of which improvement the following is a specification.

The invention described herein relates to certain improvements in molds for axle-boxes and other tubular articles. As heretofore constructed, these molds oonsistedof a suitably-shaped matrix formed vertically in a simple mold box or flask, said matrix being closed at its lower end and open at its upper end. At the ends of the matrix were formed suitable seats for centering and supporting the core, the print at the upper end of the core entirely filling and closing the open end of the matrix and serving as a cope. Through the print at the upper end of the core the sprues were formed for the reception of the molten metal. Molds of this construction are objectionable for the reason that unless both the Walls of the matrix and the core were made quite hard and firm the molten metal would cut away the molding material, thereby rendering the casting useless either on accountof its rough surfaces or flaws caused by the molding material carried into the body of the casting. On the other hand, the molder in his endeavors to make the core and the walls of the matrix sufficiently firm toprevent their being washed away, as stated, frequently made the walls and core so dense and hard as to cause scabs on the casting.

The obj ect of the invention described herein is to so construct the mold as to avoidall liability of its walls being washed or the formation of scabs on the casting formed therein.

In the accompanying drawings, forming a part of this specification, Figure 1 is a top plan, and Fig. 2 a sectional elevation, of the flask and the patterns in position therein. Figs. 3 and 4 are similar views of the completed mold.

In the practice of my invention the conical flask 1 is placed in an inverted position upon the mold-board 2, arranged above a platen or follow-board 2, having the patterns 3 for the axle-box and the pattern'et for the runner secured thereto, said patterns projecting up through the mold. At their ends the patterns 3 are provided with suitably-shaped print-patterns 5 and 6 for forming the seats for the bearings of the cores, the print-pattern 5 being made conical, so as to guide the core at its lower end, and the print-pattern 6 being a sli ghtly-taperin g enlargement of the pattern. The runner-pattern 4 is a round bar slightly tapering to facilitate its withdrawal from the mold. The molding material is packed in the usual manner around the patterns and Struck oft" at the upper end of the mold. The pattern 7, which consists of a central hub having radiating arms 8, provided at their outer ends with vertical fingers 9, is then pressed into the molding material until its hub rests upon the end of the runner-pattern 4 and the fingers 9 upon the ends of the patterns 3 at the base of the prints 5, thereby forming gates 10, connecting the runner 11 with the matrices of the mold. The pattern 7 is then removed, the pat-terns 3 and a drawn down through the mold-board, the flask inverted and placed upon a leveled-off portion on the foundryfioor, or else upon a specially-prepared drag having a plain upper surface, and the cores 12, formed of green sand, placed in position. These cores are provided at their lower ends with conically-shaped bearings adapted to fit in the seats at the lower ends of thematrices and at their upper ends with bearin'gsor prints adapted to close the upper ends of the matrices and form the copes therefor. Itwill be noticed that the gates 10 are formed entirely within the mold, being closed on one The molten metal side by the foundry-floor. is poured down the runner, whose walls can be made very firm and dense, onto the hard found ry-floor, or hardly-packed molding material in the drag, if used, and flows thence upwardly into the mold, gradually Welling up along the cores and wall of the matrices. As the metal wells up into the matrix, it will have no cutting or washing action, and hence the molding material need be packed only Suffieiently hard to resist the outward pressure of the metal, thereby avoiding all liability of forming scabs, the comparatively loose molding material aflt'ording'ample facilities for the escape of gases.

While I have described my invention as embodied in a group of molds, it can be readily applied to single molds, the runner being arranged at one side of the matrix. It will be observed that the entire mold is included Within a single flask, the foundry-floor serving merely as a plug or bottom for the gates.

In the construction of mold hereinbefore referred to, wherein the gates. or sprues were formed in the cope portion of the core, it Was necessary to form the core of baked sand in order to render it suificiently strong to resist the cutting action of the metal; but in the practice of my invention the core as well as other parts of the mold are formed of green sand.

I claim herein as my invention- 1. A mold for tubular articles, having, in combination, a matrix provided at its ends with core-seats and open at one end, the matrix and core-seats being formed in the same body of sand, a core having centering prints or bearings at each end, the print at the upper end serving as a cope to close the matrix, a

runner extending entirely through the body of sand containing the matrix from the upper to the under faces thereof, and gates formed in the under side of the body of sand containing the matrix and connecting the runner and matrix, substantially as set forth.

2. A mold for tubular articles, having, in combination, a series of tWo or more matrices, each providedat its end with core-seats and open at one end, the matrices and core-seats being formed in one body of sand, a series of two or more cores having centering-prints at their ends, the upper ends or prints of the cores serving as copes to close the matrices, a centrally-arranged runner extending entirely through the body of sand containing the matrices from the upper to the under faces thereof, and gates formed in the under side of the body of sand containing the matrices and connecting the runner and matrices, substantially as set forth.

In testimony whereof I have hereunto set my hand.

JACOB KINZER.

Vitnesses:

R. H. WHITTLEsEY, DARWIN S. WoLco'rT. 

